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aodj
Joined: 20 Dec 2006
Posts: 40
Location: Reading, UK
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| Setting up the PIC |
 Posted: Wed Dec 20, 2006 9:32 am |
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I'm relatively new to the PIC scene, and the previous projects I have completed were during Uni courses.
Now that I'm attempting to do something outside of that, and I'm unable to get my PIC to initialise.
I think I've set everything up correctly, although I obviously haven't!
| Code: | #include <16f914.h>
#fuses HS,NOWDT,NOPROTECT, PUT, INTRC_IO
#use delay(clock=8000000)
#define led_0 pin_a4
#define led_1 pin_d4
#define led_2 pin_d5
#define led_3 pin_d6
#define led_4 pin_d7
#use fixed_io(a_outputs=led_0)
#use fixed_io(d_outputs=led_1,led_2,led_3,led_4)
void main()
{
output_high(led_0);
output_high(led_1);
output_high(led_2);
output_high(led_3);
output_high(led_4);
} |
That's it. I'm trying to get the PIC to atleast respond and give me an output. The outputs have LED/resistor networks attached to them so setting the outputs high should turn the LED's on.
However I'm getting nothing. The PIC is programming, a 16F914, since the CSUM varies accordingly with each change in code, yet the outputs remain resolutely dead. Even switching for a 2nd PIC doesn't change.
If anyone can point out my mistake, or where I can look for assistance on this, I will be eternally grateful. |
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Ttelmah
Guest
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| Posted: Wed Dec 20, 2006 9:46 am |
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'HS', and 'INTRC_IO', are mutually exclusive. You can only have _one_ oscillator configuration. 'HS', means 'use an external crystal, greater than 4MHz', and 'INTRC_IO', means 'use the internal oscillator'...
Best Wishes |
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aodj
Joined: 20 Dec 2006
Posts: 40
Location: Reading, UK
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| Posted: Wed Dec 20, 2006 9:50 am |
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| Thanks for the reply, I've just deleted that part, and I'm still getting nothing from the chip at all. |
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Ttelmah
Guest
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| Posted: Wed Dec 20, 2006 10:08 am |
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OK. Now add the following:
| Code: |
//At the start of your main
//Otherwise the PORTA pins, and some PORTE ones
//will wake up as analog inputs
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
//At the end of the main
while (TRUE) ;
//Otherwise the code will drop 'off the end', and send the
//processor to sleep - shouldn't stop the pins being activated,
//but is important if you want to actually do anything
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Also, have you got the MCLR pin pulled to +5v. If not, add the fuse 'NOMCLR', otherwise the processor will never start.
Best Wishes |
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aodj
Joined: 20 Dec 2006
Posts: 40
Location: Reading, UK
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| Posted: Wed Dec 20, 2006 10:16 am |
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| I'll buy you a big internet beer, that solved it! It was the NOMCLR that fixed it. |
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